The Collaborative International Dictionary of English v.0.48:

outrigged \outrigged\ adj.
   1. rigged with a structure projecting from or over the side
      of a boat for various purposes; having an outrigger; -- to
      prevent capsizing or to support an oarlock or to help
      secure a mast etc. See outrigger
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

outrigged
    adj 1: rigged with a structure projecting from or over the side
           of a boat for various purposes; to prevent capsizing or
           to support an oarlock or to help secure a mast etc